package com.ty.zls.util;

import android.graphics.Bitmap;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.QRCodeWriter;

import java.util.Hashtable;

public class QrCodeUitl {

    private final static int width = 500;
    private final static int height = 500;


    public static Bitmap createQRcodeImage(String url) throws WriterException {
        //判断URL合法性
        if (url == null || "".equals(url) || url.length() < 1) {
            return null;
        }
        Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>();
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
        //图像数据转换，使用了矩阵转换
        BitMatrix bitMatrix = new QRCodeWriter().encode(url, BarcodeFormat.QR_CODE, width, height, hints);
        int[] pixels = new int[width * height];
        //下面这里按照二维码的算法，逐个生成二维码的图片，
        //两个for循环是图片横列扫描的结果
        for (int y = 0; y < height; y++) {
            for (int x = 0; x < width; x++) {
                if (bitMatrix.get(x, y)) {
                    pixels[y * width + x] = 0xff000000;
                } else {
                    pixels[y * width + x] = 0xffffffff;
                }
            }
        }
        //生成二维码图片的格式，使用ARGB_8888
        Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
        bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
        return bitmap;
    }
}
